Concert_Photos_Magazine has added a photo to the pool:
Dave Johnston with Yonder Mountain String Band at All Good Festival on July 16, 2011 in Masontown, WV - © 2011 David Oppenheimer - Performance Impressions Concert Photography
View: larger version of the image shown here.
From the Flickr Social Group Bluegrass" that contains member uploads of bluegrass (and mandolin!) related subject matter.